Homework
Before attempting this project, be sure you have completed all of the reading assignments, hands-on labs, discussions, and assignments to date.
Design a Java class named Polygon that contains:
- A private int data field named numSides that defines the number of sides of the polygon. The default value should be 4.
- A private double data field named sideLength that defines the length of each side. The default value should be 5.0.
- A private double data field named xCoord that defines the x-coordinate of the center of the polygon. The default value should be 0.0.
- A private double data field named yCoord that defines the y-coordinate of the center of the polygon. The default value should be 0.0.
- A private double data field named apothem that defines the apothem of the polygon. The default value should 5.0.
- A private double data filed named perimeter that defines the perimeter of the polygon. The default value should 20.0.
- A no argument constructor that creates a Polygon using the default number of sides, default side length, default x- and y-coordinates, and the default apothem.
- A constructor that creates a Polygon using a specified number of sides, side length, x- and y-coordinates and the apothem
- Getter and setter methods for all data fields
- A getArea() method that returns a double value representing the area of the polygon. (Note the area of a regular Polgon can be calculated from ½ * Apothem*Perimeter)
- A toString() method that displays the number of sides, side length, x-coordinate, y- coordinate and apothem values in String format
Be sure your code compiles. You should use the command prompt and not a GUI for data entry and display.
Write a Java test program, named TestPolygon, to create 5 different polygons representing the 5 test cases you just created. When creating the five polygons, create one using the no argument constructor. For the remaining four, feel free to use any number of sides, side length and x-, and y-coordinates and apothem that are not equal to the default values and not equal to each other. For each of the five polygons, call all of the methods and display the results. For example for a Polygon with 3 sides, side length of 2.0 and x-coordinate and y-coordinates of 1.0, and apothem of 1.0 the following test data may result:
***Output***
toString(): (numsides=3, sideLength=2.0, xcoord=1.0,ycoord=1.0, apothem=1.0) getNumSides(): 3
getSideLength(): 2.0
getXCoord(): 1.0
getYCoord(): 1.0 getApothem():1.0 getPerimeter(): 6.0
getArea(): 3.0
Document your test cases in the form of table with columns indicating the input values, expected output, actual output and if the test case passed or failed. This table should contain 4 columns with appropriate labels and a row for each test case. An example template is shown below. Note that the actual output should be the actual results you receive when running your program and applying the input for the test record.
Keep in mind, for five Polygons, you will have five different output results. Also, note there is no requirement to actually draw a Polygon.
Example test cases:
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Input
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Expected Output
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Actual Output
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Pass?
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Constructor: numsides=3 sideLength=2.0 xcoord=1.0 ycoord=1.0 apothem=1.0
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** Output **
toString(): (numsides=3, sideLength=2.0, xcoord=1.0,ycoord=1.0, apothem=1.0) getNumSides(): 3
getSideLength(): 2.0
getXCoord(): 1.0
getYCoord(): 1.0 getApothem():1.0 getPerimeter(): 6.0
getArea(): 3.0
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** Output **
toString(): (numsides=3, sideLength=2.0, xcoord=1.0,ycoord=1.0, apothem=1.0) getNumSides(): 3
getSideLength(): 2.0
getXCoord(): 1.0
getYCoord(): 1.0 getApothem():1.0 getPerimeter(): 6.0
getArea(): 3.0
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Yes
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Test case 2 here
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Test case 3 here
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Test case 4 here
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Test case 5 here
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The google recommended Java style guide, provided as link in the week 2 content, should be used to format and document your code. Specifically, the following style guide attributes should be addressed:
- Header comments include filename, author, date and brief purpose of the program.
- In-line comments used to describe major functionality of the code.
- Meaningful variable names and prompts applied.
- Class names are written in UpperCamelCase.
- Variable names are written in lowerCamelCase.
- Constant names are in written in All Capitals.
- Braces use K&R style.
Submission requirements
Deliverables include all Java files (.java) and a single word (or PDF) document. The Java files should be named appropriately for your applications. The word (or PDF) document should include screen captures showing the successful compiling and running of each of the test cases. Each screen capture should be properly labeled clearly indicated what the screen capture represents. The test cases table should be included in your word or PDF document and properly labeled as well.